It is a very common practice to use the Mirror Entities tool to make a sketch symmetrical about a line after sketching one side. Did you know that you can make a sketch symmetrical while sketching? The Dynamic Mirror Entities tool is used to mirror the sketch about a line as you sketch. Note that I said while you sketch. The Dynamic Mirror Entities tool cannot mirror existing entities. If you wish to mirror existing sketch entities, you will still need to use the Mirror Entities tool. To create a symmetrical sketch dynamically, do the following:

1. Draw a centerline in a sketch. NOTE: Centerlines, Lines, Linear Model Edges and Linear edges on drawings can be used to mirror sketch entities.

2. Select the Dynamic Mirror Entities tool. If you have not added it to the Shortcut Bar or the CommandManager, you can find it in the Menu Bar by selecting Tools -> Sketch Tools -> Dynamic Mirror.

3. Select the line that will be used for the mirror. In this case, select the centerline that you sketched earlier. Notice that after selecting the line, two short lines perpendicular to the selected line will be shown on both ends. This symbol is used to denote Symmetry per ASME Y14.2M.

4.Now as you sketch, the reflected side of the sketch will automatically update as you draw.

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